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频率自动控制 pínlǜ zìdòng kòngzhì
telecom. automatic frequency control
频率自动控制: 45 phrases in 16 subjects
Air defense2
Aviation4
Computer numerical control1
Earth sciences1
Electric machinery1
Electronics11
Explosives and Explosive Ordnance Disposal1
General2
Geophysics9
Hydroelectric power stations1
Information technology1
Metallurgy1
Radio1
Space2
Technology3
Telecommunications4